ADJUSTABLE SPEED: This electric callus remover is compact, stylish, well-made and powerful. Its speed (0-1200rpm) can be adjusted by the controller, we can adjust various speeds, removing dead hard skin from feet is more convenient. | NOT BATTERY-POWERED: Unlike traditional rechargeable electric foot files, this FCR-2 electric callus remover is outlet-powered, not battery-powered. When we intend to use it, plug it into the outlet and use it right away. | REPLACEABLE SAND PAPER DISC: Comes with 60 self-adhesive sandpaper discs, made of high quality sandpaper particles, durable and sticky.1 person 1 sandpaper, easy to replace. | EASY TO USE: The electric foot file can be adjusted to various speeds so it is easy to control and safe. It's not fast, but it effectively removes dead skin without removing too much skin or healthy skin. (Please note this electric foot file is only for normal dead skin hard skin, not recommended for serious calluses.) | SAFETY PROTECTION: If too much pressure is applied, electric callus remover will not rotate. This is for our own safety and to prevent too much skin removal. (Tips for use: when using it, apply the right amount of pressure to ensure that the electric callus remover will rotate properly.)